FT232RL 3.3v-5v TTL USB Serial Port Adapter

The most reliable usb to serial converter that you can find! This is almost indispensable if you want to be able to program Pro Mini (automatically) .

Many operating systems support this chip by default. If it is not automatically installed, please find the driver for your operating system here.

Specifications:

• 3.3V or 5V TTL voltages(can be set with a jumper)
• Converts TTL logic levels to computer RS232 levels
• Power supplies: 5V, 3.3V, GND(min)
• RX (3.3V or 5V *)
• TX(3.3V or 5V *)
• Mini-USB female connection

* You can determine yourself what the voltages of the signals are. This can be with a jumper set to 3.3V or 5V.

See the datasheet under the tab "Downloads" for more information.